For the first time in my (limited) Araucarian experience, nary a cross-referenced clue. Not much need for a dictionary either: though 14D, while making some sense, was unfamiliar to me. Likewise, 20D had me guessing a bit and I needed dictionary.com to resolve matters. Finally, 1D was new to me as well but the wordplay fell into place: obviously didn’t sing enough carols in school. Not sure I detect a theme here either.